Defense mechanisms: the list, the neighbors, and the one that is almost always the answer.
Freud's and Anna Freud's defenses, sorted by how they get confused on the exam.
By Dr. Andrew Wichterman · September 15, 2026 · 5 min read · Updated October 4, 2026
Defense mechanisms are unconscious strategies the ego uses to manage anxiety. The exam gives you a behavior and asks you to name the defense, and the distractors are always the near neighbors. Here they are grouped by confusion.
The ones people mix up
- Repression versus suppression: repression is unconscious forgetting; suppression is a conscious decision not to think about something. Suppression is considered mature.
- Displacement versus projection: displacement redirects a feeling onto a safer target (kicking the dog after a bad day). Projection attributes your own unacceptable feeling to someone else (the hostile person who thinks everyone is hostile).
- Rationalization versus intellectualization: rationalization is a plausible but false explanation for behavior. Intellectualization retreats into abstract thinking to avoid the feeling.
- Reaction formation versus undoing: reaction formation expresses the opposite of the unacceptable impulse (excessive kindness toward someone you resent). Undoing performs an act to cancel out a prior one.
- Regression versus fixation: regression is a return to an earlier stage under stress. Fixation is being stuck at a stage.
- Identification versus introjection: identification models oneself on another; introjection takes in another's values wholesale.
The rest of the list
Denial (refusing to accept reality), sublimation (channeling an impulse into something socially valued, the most mature defense), compensation (excelling in one area to offset weakness in another), conversion (psychological conflict expressed as a physical symptom), splitting (seeing people as all good or all bad, associated with borderline personality), and humor.
The answer that is almost always right
When an item asks which defense is healthiest or most adaptive, the answer is sublimation. When it asks which is most primitive, the answer is denial or splitting. Vaillant's hierarchy sorts defenses from psychotic through immature and neurotic to mature; the exam borrows that ordering.
Vaillant's four levels
Vaillant followed the Harvard men of the Grant Study for decades and sorted their defenses by how well the men who used them fared. Level one, psychotic: denial of external reality, distortion and delusional projection. Level two, immature: projection, passive aggression, acting out, fantasy, hypochondriasis and, in later versions, splitting and dissociation. Level three, neurotic: repression, displacement, reaction formation, intellectualization, isolation of affect and undoing. Level four, mature: sublimation, humor, altruism, suppression and anticipation.
The exam uses the hierarchy in two ways. Directly, it asks which defense is most mature or most primitive, and the list above answers it. Indirectly, it describes a client and asks what the defense pattern suggests about functioning: a client who relies on splitting and projection is describing a different level of organization than one who uses intellectualization and humor, and the item may be pointing toward a personality disorder diagnosis rather than a defense name. Mature defenses are still defenses; they manage anxiety, but they do so without distorting reality or damaging relationships.
Four items, worked
A man who is furious at his supervisor comes home and shouts at his son over an unwashed dish. Displacement: the feeling is his, and it moved to a safer target. If he had instead become convinced that his son was angry at him, that would be projection. A woman who was passed over for a promotion tells her friends she never wanted the extra responsibility. Rationalization: a plausible, face-saving explanation that is not the real one. If she had instead delivered a detached analysis of organizational promotion patterns, that would be intellectualization.
A father who resents the time his newborn takes becomes elaborately, anxiously devoted to the child. Reaction formation: the opposite of the unacceptable impulse, expressed with a telltale excess. A college student, overwhelmed by exams, begins calling home several times a day and asks her mother to make decisions for her. Regression: a return to earlier dependence under stress. In each case the distractor is the neighbor from the pairs above, and the deciding question is the same: where did the feeling go, and did the person know it went there?
Defenses in the counseling room
Psychodynamic items also test what a counselor does with a defense, and the answer is almost never to name it on the spot. Defenses are managing anxiety the client cannot yet tolerate; stripping one away early produces more anxiety, not insight. The textbook sequence is to notice the defense, understand what it protects, strengthen the alliance, and interpret only when the client is close to seeing it themselves. An item in which the counselor confronts denial in the first session is describing an error, not a technique.
Resistance, in this frame, is a defense operating against the therapy itself: lateness, silence, intellectualizing about the process, sudden improvement before a difficult topic. The keyed response explores it with curiosity rather than pushing through it. Transference and countertransference belong to the same cluster and are tested nearby: the client's displacement of feelings about past figures onto the counselor, and the counselor's own reactions, which the counselor takes to supervision rather than acting on. Knowing the defenses as a list earns the recognition items; knowing what they are for earns the response items.
Anna Freud
She catalogued the defenses in The Ego and the Mechanisms of Defence (1936) and founded child psychoanalysis. If an item asks who systematized the defense mechanisms, the answer is Anna, not Sigmund.
Practice this. The flashcards and practice tests on this site are sorted by content area, so you can drill this one until it holds.
Learn the pairs, not the list. The exam only ever asks you to tell two neighbors apart.